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Stockholders' Equity - Schedule of Stock Repurchases (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Stockholders Equity [Line Items] |  |  |  |
Common stock and additional paid-in-capital reductions | $ 14,765 mygn_AmountOfReductionInCommonStockAsResultOfStockRepurchases | $ 25,096 mygn_AmountOfReductionInCommonStockAsResultOfStockRepurchases | $ 24,960 mygn_AmountOfReductionInCommonStockAsResultOfStockRepurchases | $ 55,036 mygn_AmountOfReductionInCommonStockAsResultOfStockRepurchases
Charges to retained earnings | $ 43,559 mygn_AmountChargedToRetainedEarningsAsResultOfStockRepurchases | $ 52,713 mygn_AmountChargedToRetainedEarningsAsResultOfStockRepurchases | $ 78,992 mygn_AmountChargedToRetainedEarningsAsResultOfStockRepurchases | $ 125,088 mygn_AmountChargedToRetainedEarningsAsResultOfStockRepurchases
Common Stock |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Shares purchased and retired | 1,733 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,185 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,950 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,991 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember

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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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